Galaxy Clusters Selected via the Sunyaev-Zel'dovich Effect in the SPTpol 100-square-degree Survey

N. Huang, L. E. Bleem, B. Stalder, P. A.R. Ade, S. W. Allen, A. J. Anderson, J. E. Austermann, J. S. Avva, J. A. Beall, A. N. Bender, B. A. Benson, F. Bianchini, S. Bocquet, M. Brodwin, J. E. Carlstrom, C. L. Chang, H. C. Chiang, R. Citron, C. Corbett Moran, T. M. CrawfordA. T. Crites, T. De Haan, M. A. Dobbs, W. Everett, B. Floyd, J. Gallicchio, E. M. George, A. Gilbert, M. D. Gladders, S. Guns, N. Gupta, N. W. Halverson, N. Harrington, J. W. Henning, G. C. Hilton, G. P. Holder, W. L. Holzapfel, J. D. Hrubes, J. Hubmayr, K. D. Irwin, G. Khullar, L. Knox, A. T. Lee, D. Li, A. Lowitz, M. McDonald, J. J. McMahon, S. S. Meyer, L. M. Mocanu, J. Montgomery, A. Nadolski, T. Natoli, J. P. Nibarger, G. Noble, V. Novosad, S. Padin, S. Patil, C. Pryke, C. L. Reichardt, J. E. Ruhl, B. R. Saliwanchik, A. Saro, J. T. Sayre, K. K. Schaffer, K. Sharon, C. Sievers, G. Smecher, A. A. Stark, K. T. Story, C. Tucker, K. Vanderlinde, T. Veach, J. D. Vieira, G. Wang, N. Whitehorn, W. L.K. Wu, V. Yefremenko

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38 Scopus citations


We present a catalog of galaxy cluster candidates detected in 100 square degrees surveyed with the SPTpol receiver on the South Pole Telescope. The catalog contains 89 candidates detected with a signal-to-noise ratio greater than 4.6. The candidates are selected using the Sunyaev-Zel'dovich effect at 95 and 150 GHz. Using both space- and ground-based optical and infrared telescopes, we have confirmed 81 candidates as galaxy clusters. We use these follow-up images and archival images to estimate photometric redshifts for 66 galaxy clusters and spectroscopic observations to obtain redshifts for 13 systems. An additional two galaxy clusters are confirmed using the overdensity of near-infrared galaxies only and are presented without redshifts. We find that 15 candidates (18% of the total sample) are at redshift z ≥ 1.0, with a maximum confirmed redshift of zmax = 1.38 ± 0.10. We expect this catalog to contain every galaxy cluster with M500c = 2.6 ×1014M⊙ h70-1 and z > 0.25 in the survey area. The mass threshold is approximately constant above z = 0.25, and the complete catalog has a median mass of approximately M500c = 2.7 ×1014M⊙ h70-1. Compared to previous SPT works, the increased depth of the millimeter-wave data (11.2 and 6.5 μK-arcmin at 95 and 150 GHz, respectively) makes it possible to find more galaxy clusters at high redshift and lower mass.

Original languageEnglish (US)
Article number110
JournalAstronomical Journal
Issue number3
StatePublished - Mar 2020

Bibliographical note

Funding Information:
2020-03-01 2020-02-18 15:52:39 cgi/release: Article released bin/incoming: New from .zip National Science Foundation PLR-1248097 National Science Foundation PLR-1852617 NSF Physics Frontier Center PHY-0114422 Gordon and Betty Moore Foundation GBMF 947 NSF GRFP DGE 1752814 DOE De-AC02-07CH11359 DOE DE-AC02-06CH11357 NSF AST-0956135 NSF AST-1716965 NSF CSSI-1835865 DOE DE-AC02-76SF00515 NASA NNX15AE12G ERC-StG 71676 FARE-MIUR R165SBKTMA Australian Research Council DP150103208 yes

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© 2020. The American Astronomical Society. All rights reserved..


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